import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;

@WebServlet("/show")
public class showRequestServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //调用上述api, 把得到的结果构造成一个字符串,返回给客户端
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append(req.getProtocol());
        stringBuilder.append("<br>");
        stringBuilder.append(req.getMethod());
        stringBuilder.append("<br>");
        stringBuilder.append(req.getRequestURI());
        stringBuilder.append("<br>");
        stringBuilder.append(req.getContextPath());
        stringBuilder.append("<br>");
        stringBuilder.append(req.getQueryString());
        stringBuilder.append("<br>");
        

        Enumeration<String> headerNames = req.getHeaderNames();
        while (headerNames.hasMoreElements()) {
            String key = headerNames.nextElement();
            String value = req.getHeader(key);
            stringBuilder.append(key + ":" + value + "<br>");
        }

        resp.setContentType("text/html; charset = utf8");

        resp.getWriter().write(stringBuilder.toString());
    }
}
